我试图从asp.net会员表中获取用户列表。
我想在一行中显示用户ID，用户名，电子邮件和角色名称。
我的陈述如下
SELECT [Dev].[dbo].[aspnet_Users].[UserId],
[UserName],
[Email],
[RoleName]
FROM [Dev].[dbo].[aspnet_Users]
INNER JOIN [Dev].[dbo].[aspnet_Membership]
ON [Dev].[dbo].[aspnet_Users].[UserId] = [Dev].[dbo].[aspnet_Membership].[UserId]
INNER JOIN [Dev].[dbo].[aspnet_UsersInRoles]
ON [Dev].[dbo].[aspnet_Users].[UserId] = [Dev].[dbo].[aspnet_UsersInRoles].[UserId]
Inner Join [Dev].[dbo].[aspnet_Roles]
On [Dev].[dbo].[aspnet_UsersInRoles].[RoleId] = [Dev].[dbo].[aspnet_Roles].[RoleId]
我得到的结果接近我想要的结果，除了我为角色名称获得多行。
| UserID | UserName | Email | RoleName |
|--------|----------|-------|----------|
| 1 | Jon | Jon@ | Author |
| 1 | Jon | Jon@ | Approver |
| 1 | Jon | Jon@ | Admin |
| 2 | Mary | Mary@ | Author |
| 2 | Jon | Mary@ | Approver |
如何将多行名称显示为一行？
| UserID | UserName | Email | RoleName |
|--------|----------|-------|---------------------------|
| 1 | Jon | Jon@ | Author, Approver, Admin |
| 2 | mary | mary@ | Author, Approver |